<?php


namespace app\common\util;


class Helper
{
    //随机字符串
    static function getRandStr($len){
        $str = "1234567890asdfghjklqwertyuiopzxcvbnmASDFGHJKLZXCVBNMPOIUYTREWQ";
        return substr(str_shuffle($str),0,$len);
    }
}
